import java.util.Arrays;

public class Solution706 {
    int[] data;

    public Solution706() {
        data=new int[1000001];
        Arrays.fill(data,-1);
    }

    /** value will always be non-negative. */
    public void put(int key, int value) {
        data[key]=value;
    }

    /** Returns the value to which the specified key is mapped, or -1 if this map contains no mapping for the key */
    public int get(int key) {
        return data[key];
    }

    /** Removes the mapping of the specified value key if this map contains a mapping for the key */
    public void remove(int key) {
        data[key]=-1;
    }
}
